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HRO Junior HRO-JR

HRO Junior HRO-JR; National Company; (ID = 1733397) Amateur-R
HRO Junior HRO-JR; National Company; (ID = 845631) Amateur-R HRO Junior HRO-JR; National Company; (ID = 845632) Amateur-R
HRO Junior HRO-JR; National Company; (ID = 845633) Amateur-R HRO Junior HRO-JR; National Company; (ID = 845634) Amateur-R
HRO Junior HRO-JR; National Company; (ID = 845635) Amateur-R HRO Junior HRO-JR; National Company; (ID = 845636) Amateur-R
HRO Junior HRO-JR; National Company; (ID = 845637) Amateur-R HRO Junior HRO-JR; National Company; (ID = 845638) Amateur-R
HRO Junior HRO-JR; National Company; (ID = 1285331) Amateur-R
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HRO Junior HRO-JR; National Company; (ID = 845631) Amateur-R
National Company;: HRO Junior HRO-JR [Amateur-R] ID = 845631 751x397
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For model HRO Junior HRO-JR, National Company; Cambridge & Malden (MA):
Ebay 160494010803 kbdgh
 
Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
 
National Toy Co.
Brand
Thrillbox
Year: 1936–1943 ? Category: Amateur-Receiver (amateur bands, may include broadcast bands)
Valves / Tubes 9: 58 or 6D6 58 or 6D6 57 or 6C6 58 or 6D6 58 or 6D6 2B7 or 6B7 2A5 or 42 57 or 6C6 57 or 6C6
Main principle Superheterodyne (common); ZF/IF 456 kHz; 2 AF stage(s)
Tuned circuits 11 AM circuit(s)
Wave bands Broadcast plus more than 2 Short Wave bands.
Details
Power type and voltage Powered by external power supply or a main unit. / AC 6.3 & DC 180-240 Volt
Loudspeaker - This model requires external speaker(s).
Power out 1.5 W (unknown quality)
from Radiomuseum.org Model: HRO Junior HRO-JR - National Company; Cambridge &
Material Metal case
Shape Boatanchor (heavy military or commercial set >20 kg).
Dimensions (WHD) 440 x 220 x 300 mm / 17.3 x 8.7 x 11.8 inch
Notes

Low budget version of the HRO Senior withoud bandspread, only one calibration chart in the center of coil set, no S meter, no crystal filter or selectivity control.

After WWII a kit was available to install an S meter and to upgrade the set to a HRO Senior, it's coil sets were compatible.

Coverage : 1.7 – 30 MHz ( 4 standard ganged coil sets for 1.7 – 4, 3.5 – 7.3, 7 – 14.4, 14 – 30 MHz included, 2 coil sets for broadcast immediately available at extra cost, 7 more coil sets sold later including long waves ( total spectrum covered from 50 kHz to 54 MHz ).

Modes AM/CW/SSB (BFO).

The 0 – 500 epicyclic readout dial allows for continuous analog tuning while digitally indicating incremental progress over a range of ten full turns of the large tuning knob that tunes with velvet smoothness. Ten times the circumference of the dial is nearly 4 meters on a normal dial scale, which delivers great frequency resolution. The dial is not calibrated, so more used as logging dial, the frequency is determined used printed calibration charts on coil sets.

External "dog house" power supplies used : 5886 (B+ 180V), PSU 697 (B+ 240V) or 5897 (filaments 2,5V AC, B+ 230V DC) for sets equipped with battery valves set.

Net weight (2.2 lb = 1 kg) 12.5 kg / 27 lb 8.5 oz (27.533 lb)
Price in first year of sale 99.00 USD
Source of data Communications Receivers
Mentioned in Shortwave Receivers - Past & Present (3rd ed.)
Literature/Schematics (1) Short Wave Craft March 1936 page 666.

Model page created by Martin Bösch. See "Data change" for further contributors.



All listed radios etc. from National Company; Cambridge & Malden (MA)
Here you find 430 models, 275 with images and 162 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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